2(1H)-Quinozalinones and process therefor

ABSTRACT

2(1H)-Quinazolinone derivatives or salts thereof which are useful as anti-inflammatory or analgesic agents and represented by the formula,   WHEREIN R is hydroden halogen, lower alkyl, lower alkenyl, aralkyl, lower alkoxyalkyl or di-lower-alkylaminoalkyl, each of R1, R2 and R3 is hydrogen, halogen, lower alkyl, lower alkoxy, nitro, lower alkylthio, lower alkylsulfonyl or trifluoromethyl, can be produced advantageously by reacting a novel trihaloacetamidobenzophenone derivative represented by the formula,   WHEREIN R, R1, R2 and R3 have the same meanings as defined above, and X1, X2 and X3 are halogen atoms, with ammonia. The trihaloacetamidobenzophenone derivative is produced by reacting a 2-aminobenzophenone derivative represented by the formula,   WHEREIN R, R1, R2 and R3 have the same meanings as defined above, with a trihaloacetic acid or its reactive derivative.

United States Patent 1191 Inaba et al.

[4 1 Dec. 2, 1975 2(1H)-QUINOZALINONES AND PROCESS THEREFOR [75] Inventors: Shigeho lnaba, Takarazuka; Kei

Takahashi, Takatsuki; Michihiro Yamamoto, Takarazuka; Kazuo Mori, Kobe; Kikuo lshizumi, Minoo; Hisao Yamamoto, Nishinomiya, all of Japan [73] Assignee: Sumitomo Chemical Company,

Limited, Osaka, Japan 22 Filed: May 2, 1972 21 Appl. No.: 252,947

[44] Published under the Trial Voluntary Protest Program on January 28, 1975 as document no. B 252,947.

Related US. Application Data [63] Continuation of Ser. No. 840,856, July 10, 1969,

abandoned.

[30] Foreign Application Priority Data July 18, 1968 Japan 43-50982 July 18, 1968 Japan." 43-50983 Oct. 18, 1968 Japan 43-76377 [52] U.S. CI. ..260/25l QB, 260/2564 Q,

[51] Int. Cl. C07D 239/82 [58] Field of Search 260/251 QB, 256.4 Q,256.5 R

[56] References Cited UNITED STATES PATENTS 3,723,432 3 1973 on 260/251 QB FOREIGN PATENTS OR APPLICATIONS 1,520,743 4/1968 France Primary Examiner-Raymond V. Rush Attorney, Agent, or Firm-Stcvens, Davis, Miller & Mosher [57] ABSTRACT 2 (1H)-Quinazolinone derivatives or salts thereof which are useful as anti-inflammatory or analgesic agents and represented by the formula,

R, vi a to 2 l wherein R, R R and R have the same meanings as defined above, and X X and X are halogen atoms, with ammonia. The trihaloacetamidobenzophenone derivative is produced by reacting a 2' aminobenzophenone derivative represented by the formula,

wherein R, R R and R have the same meanings as defined above, with a trihaloacetic acid or its reactive derivative.

3 Claims, No Drawings 1 2(1H)-QUINOZALINONES AND PROCESS THEREFOR et) 1 l l wherein R is selected from the group consisting of hydrogen, C alkyl, C alkenyl, aralkyl, (C alkoxy) C alkyl or di(C alkyl') amino (C alkyl); R R and R 'are each selected from the group consisting of hydrogen, halogen, C alkyl, C alkoxy,nitro, C alkylthio, C alkylsulfonyl or trifluoromethyl. The quinazoline derivatives represented by the aforesaid general formula (I), which include novel compounds, have excellent pharmacological, properties particularly as antiinflammatory and analgesic agents; they are also useful as intermediates for preparing other medicines. Thus the present invention offers a new and useful process for producing commercially such valuable compounds.

A few processes for producing some of these 2( III)- quinazolinone derivatives have heretofore been described. For instance, it is known to obtain the 2( 1H)- quinazolinone derivative by fusing a 2-aminobenzophenone derivative with urea, and further, if desired, alkylating the resulting compound. (T. S. Sulkowski and S. J. Childress, J. Org. Chem. 27, 4424 1962)) Contrary to these procedures, we have found, unexpectedly, that 2( lH)-quinazolinone derivatives of the formula (I) can be smoothly and economically prepared in high yields and in high purity by treating with ammonia a trihaloacetamidobenzophenone derivative of the fonnula.

wherein X X 'and X are same or differenthalogen atoms; and R, R,, R and R}; are as defined above in the formula (I).

Such process for converting a trihaloacetamidobenzophenone derivative 'into a quinazolinone derivative has not heretofore been described or suggested in any literaturerThis new and useful process thus differs markedly from the known methods and represents an improvement thereover.

.12 Among these 'compounds produced by the abovementioned processj'the quinazolinone derivatives represented by the general formulas,

Ra Ru wherein R, R R and R are as defined above, and R is C, alkoxy C 'alkyl, are novel. They are found to possess prominent anti-inflammatory effects in animal tests with low toxicity and tobe also useful as intermediates'for synthesis of other quinazolinone derivatives. Illustratively, l-methyl-4-phenyl-6-nitro-2( l H quinazolinone, shows remarkable inhibitory action for carrageenin-induced edema in rat, and inhibits the edema by 32.9% at 50 mg/kg (per 03), 50.5% at 100 mg/kg (per os)'and 60.6% at 400 mg/kg (per os), while no toxic symptoms are observed and occult bleeding is negative in feces after oral administration of 1,000 mg/kg in rat. The anti-inflammatory activity of this compound is .4 times higher than that of 1,2-diphenyl- 3,5-dioxo-4-n-butylpyrazolidine (phenylbutazone), and the acute, subacute and chronic toxicities are much lowerthan those of phenylbutazone.

Thus, one object of the present invention is to provide a novel process for producing commercially such valuable quinazolinone derivatives.

Anotherobject of the invention is to provide novel quinazolinone derivatives excellent in anti-inflammatory effects.

Other objects of the present invention will be apparent from the following description. 3

In order to accomplish these objects, the present invention provides a process for producing quinazolinone derivatives represented by the aforesaid formula (l), which comprises treating a trihaloacetamidobenzophenone derivative represented by the general formula (II) with ammonia.

The trihaloacetamidobenzophenone derivatives of the formula (II) which are employed in the present invention are novel compounds. They, can be, for example, prepared by contacting a corresponding 2- aminobenzophenone. derivative with a trihaloacetic acid or its reactive derivative. 9'

In preparing the quinazolinone derivatives according to this invention, a trihaloacetamidobenzophenone derivative represented by the aforesaid general formula (II) is reacted with ammonia in the presence of a solvent. As the solvent employed for this process alcohols are desirable. Foiinstance, it is suitably selected from such alcohols as methanol, ethanol, isopropyl alcohol,

tertiary butylalcohol and the like. I

hydroxyquinazoline derivative because of the formation of its keto-enol tautomerism. Accordingly, the quinazoline derivative maybe formed as various salts by treating with suitable base. Examples of the base include sodium hydroxide. potassium hydroxide sodium carbonate, potassium carbonate and the like.

According to the process of the present invention, there are produced such quinazolinone derivatives as shown below.

4-phenyl-2( l H )-quinazolinone 4-phenyl-5-chloro-2( 1H )-quinazolinone 4-phenyl-6-chloro-2( 1H )-quinazolinone 4-phenyl-7-chloro-2( 1H )-quinazolinone 4-phenyl-6-bromo-2( l H )-quinazolinone 4-phenyl-6-methyl-2( 1H )-quinazolinone 4-phenyl-6-methoxy-2( l H )-quinazolinone 4-phenyl-6-nitro-2( 1H )-quinazolinone' 4-phenyl-6-methythio-2( l H )-q'uinazolinone 4-phenyl-6-methylsulfonyl-2( l H )-quinazolinone 4-phenyl-6-trifluoromethyl-2( l H )-quinazolinone 4-phenyl-6-chloro-8-nitro-2( 1H )-quinazolinone 4-phenyl-6,8-dichloro-2( l H )-quinazolinone' 4-phenyl-6,7-dimethoxy-2( lH)-quinazolinone 4(o-chlorophenyl )-6-chloro-2( 1H )-quinazolinone 4-(o-chlorophenyl )-6-nitro-2( 1H )-quinazolinone 4-(m-chlorophenyl)-6-methoxy-2( l H )-quinazolinone 4-(o-fluorophenyl)-6-chloro-2( l H )-quinazolinone 4-(o-fluorophenyl )-6-nitro-2( l H)-quinazolinone 4-(p-methoxyphenyl )-6-chloro-2( 1H)-quinazolinone 4-(p-tolyl )-6-chloro-2( l H )-quinazolinone 4-(o-tolyl)-6-chloro-2( l H)-quinazolinone 4-( p-nitrophenyl )-6-nitro-2( l H )quinazolinone l-methyl-4-phenyl-2( 1H )-quinazolino ne lmethyl-4-phenyl-5-chloro-2( 1H )-quinazolinone lmethyl-4-phenyl-6-chloro-2( lH)-quinazolinone lmethyl-4-phenyl-7-chloro-2( lH)-quinazolinone 1methyl-4-phenyl-6-bromo-2( l H)-quinazolinone lmethyl-4-phenyl-6-fluoro-2( 1H )-quinazolinone 1-methyl-4-phenyl-6-chloro-8-methyl-2( 1H quinazolinone lmethyl-4-phenyl-6-methoxy-2( l )-quinazolinone lmethyl-4-phenyl-6-methylthio-2( l H )-quinazoli- 1-methyl-4-(0-tolyl)-6-nitro-2( lH)-quinazolinone lethyl-4-phenyl-6-nitro-2( l H)-quinazolinone lpropyl-4-phenyl-6-nitro-2( lH)-quina zolinone 1-methyl-4-(p-methoxyphenyl)'6-chloro-2(1H)- quinazolinone 1methyl-4-(o-chlorophenyl) 6-chloro-2( 1H)- quinazolinone l-methyl-4-(p-chiorophe nyl)-6-chloro-2( 1H)- quinazolinone 4 1 .-meth yl-4-(m-chlorophenyl)-6rchloro-2( l H quinazolinone 1-methyl-4-(m-chlorophenyl)-6-methoxy-2( l H)- quinazolinone 1-methyl-4-(o-fluorophenyl)-6-chloro-2( 1H quinazolinone I lmethyl-4-(p-fluorophenyl ).-6-ch1oro-2( lH quinazolinone lethyl-4-phenyl-6-chloro-2( l H)-quinazolinone l-ethyl-4-( o-tolyl )-6-chloro-2( lH)-quinazolinone l-isopropyl-4-phenyl-6-chloro-2( l H )-quinazolinone 1isopropyl-4-phenyl-6-bromo-2( l H )-quinazolinone l-isopropyl-4-phenyl-6-methoxy-2( 1H )-quinazoline lisopropyl-4-phenyl-6nitro-2( l H)-quinazolinone 1-isopropyl-4-phenyl- 6-trifluoromethyl-2( 1H quinazolinone 1-isopropyl-4-(o-fluorophenyl )-6-chloro-2( 1H quinazolinone l-isopropyl-4-( p-chlorophenyl)-6-chloro-2( 1H quinazolinone l-isopropyl-4-(o-tolyl )-6-chloro-2( l H )-quinazolinone l-isopropyl-4-( p-tolyl )-6-chloro-2( l H )-quinaz0linone I 1-isopropyl-4-(o-chlorophenyl)-6-methoxy-2( l H quinazolinone 1-isobutyl-4-phenyl-6-chloro-2( 1H )-quinazolinone ln-butyl-4-phenyl-6-chloro-2( l H)-quinazolinone lallyl-4-phenyl-6-chloro-2( 1H )-quinazolinone lbenzyl-4-phenyl-6-chloro-2( lH)-quinazolinone 1-ethoxyethyl-4-(o-fluorophenyl)-6-chloro-2( 1H quinazolinone l-( ,B-diethylaminoethyl )-4-(o-fluorophenyl )-6- chloro-2( lH)-quinazolinone l-( B-diethylaminoethyl)-4-phenyl-6-chloro-2( 1H)- quinazolinone In the next place, a conventional process for preparing the trihaloacetamidobenzophenone derivative of the formula (ll) is explained below.

The Z-aminobenzophenone derivative of the formula,

(III) wherein X,, X and X have the same meanings defined above in formula (II), or its reactive derivative such as acid halides, acid anhydrides, esters and the like. In practicing this process, trihaloacetyl halides such as chloride and bromide are particularly useful,

The reaction may be carried out in the presence or absence of an inert solvent with a condensing agent or without it., The choice. of the solvent depends on the trihaloacetic acid or its reactive derivative employed, 2-(N-methyl-trichloroacetamido)-5-nitrobenzophethe solvent inert towards the two starting materials can none be preferably used. Available inert solvents are, for ex- 2-(N-methyl-trichloroacetamido)-5,3 '-dichlorobenample, benzene, toluene, xylene, ether, tetrahydrofuzophenone ran, methylene chloride, chloroform and the like. How- 5 2-(N-methyl-trichloroacetamido)-5-methoxy-3'- ever, when the trihaloacetic acid derivative or the conchlorobenzophenone densing agent employed is liquid, the reaction is carried 2-(N-methyl-trichloroacetamido)-5 -nitro-2'- out in the materials as a solvent without employment of fluorobenzophenone other reaction medium. In the case of acid halides, it is 2-(N-methyl-trichloroacetamido)-5-chloro-4'- desirable to carry out the reaction in the presence of a 10 fluorobenzophenone condensing agent, which includes an inorganic base 2-(N-methyl-trichloroacetamido)-5-nitro-3-- such as sodium hydroxide, potassium hydroxide, sochlorobenzophenone dium carbonate and potassium carbonate, or an or- 2-(N-methyl-trichloroacetamido)-5-nitro-2'-methylganic base such as pyridine, triethy] amine and the like. benzophenone Excess of the Z-aminobenzophenone derivative is also 2-(N-methyl-trichloroacetamido)-2-chloro5 used as a base. If a free trihaloacetic acid is used, suitnitrobenzophenone able condensing agents are,,in particular, dicyclohexyl- 2-(N-ethyl-trichloroacetamido)-5-nitrobenz0phecarbodiimide, N-cyclohexyl-N-morpholinoethylcarnone bodiimide or phosphorus trichloride. 2-(N-methyl-trichloroacetamido)-5,2-dichloroben- In accordance with the above process, there are obzophenone tained, for example, following trihaloacetamidoben- 2-(N-methyl-trichloroacetamido)-5-chloro-2'- zophenone derivatives. fluorobenzophenone 2-trichloroacetamidobenzophenone 2-( N-allyl-trichloroacetamido )benzophenone 2-trichloroacetamido-4-chlorobenzophenone 2-( N-ethyl-trichloroacetamido )-5-chloro-2 '-methyl- 2-trichloroacetamido-5-chlorobenzophenone benzophenone, 2-trichloroacetamido-6-chlorobenzophenone 2-(N-isopropyl-trichloroacetamido)-5-chloroben- 2-trichloroacetamido-5*bromobenzophenone zophenone 2-trichloroacetamido-S-methylbenzophenone 2-(N-isopropyl-trichloroacetamido)-5-bromoben- 2-trichloroacetamido-5-methoxybenzophenone zophenone 2-trichloroacetamido-S-nitrobenzophenone i 2-(N-isopropyl-trichloroacetamido)-5-methoxyben- 2-trichloroacetamido-5-methylthiobenzophenone zophenone 2-trichloroacetamido-5-methylsulfonylbenzophe- 2-(N-isopropyl-trichloroacetamido)-5-nitrobennone zophenone 2-trichloroacetamido-5-trifluoromethylbenzophe- 2-( N-isopropyl-trichloroacetamido )-5-trifluorornenone thylbenzophenone 2-trichloroacetamido-5,2-dichlorobenzophenone 2-(N-isopropyl-trichloroacetamido)-2-fluoro-5- 2-trichloroacetamido-S-chloro-Z -fluorobenzopher chlorobenzophenone none 2-(N-isopropyl-trichloroacetamido)-4',5- 2-trichloroacetamido-5,4-dichlorobenzophenone dichlorobenzophenone 2-trichloroacetamido-5-chloro-2-methylbenzophe- 2-(N-isopropyl-trichloroacetamido)-4-methyl-5- none chlorobenzophenone 2-trichloroacetamido-5-chloro-4-methoxyben- 2-( N-isopropyl-trichlo roacetamido )-2 -methyl-5- zophenone chlorobenzophenone Z-trichloro acetamido-4,5 -dimethoxybenzophenone 2-( N-isopropyl-trichloroacetamido )-2 -chloro-5- 2-trichloroacetamido-5-methoxy'3 -chlorobenmethoxybenzophenone zophenone 2-( N-isobutyl-trichloroacetamido )-5-chloroben- 2,-trichloroacetamido-5,4'-dinitrobenzophenone zophenone Z-trichloroacetamido-S ,2 -dinitrobenzophenone 2-( N-allyl-trichloroac etamido)-5-chlorobenzophe- 2-trichloroacetamido-5-nitro-2 -chloroben2ophenone none 2-(N-benzyl-trichloroacetamido)-5-chlorobenzoplie-v Z-trichloroacetamido-5-nitro-2'-fluorobenzophenone none 2-( N-ethoxyethyl-trichloroacetamido )-5-chloro?2 2-trichloroacetamido-5-chloro-4-methylbenzophefluorobenzophenone none 2-[N-(B-diethylaminoethyl)trichloroacetamido]-5- 2-tribromoacetamidobenzophenone chloro-2 '-fluorobenzophenone 2-tribromoacetamido-5-chlorobenzophenone This invention is further disclosed in the following Z-trifluoroacetamido-S-chlorobenzophenone Examples of preferred embodiments thereof, which are 2-(N-methyl-trichloroacetamido)benzophenone presented for purposes of illustration and are not in- 2-(N-methyl-trichloroacetamido)-5-chloroben- 6 tended to limit the scope of the invention.

zophenone 0 2-(N-methyl-trichloroacetamido)-5-bromoben- EXAMPLE 1 zophenone Step A 2-(N-methyl-trichloroacetamido)-5-methoxyben- A solution of 5.5 g of trichloroacetyl chloride in 20 zophenone ml. of dry benzene is added dropwise to a solution of 2'(N-methyl-trichloroacetamido)5-methylthioben- 13.9 g of 2-amino-5-chlorobenzophenone in 40 ml. of zophenone dry benzene with stirring and cooling. After the mix- 2-( N-methyl-trichloroacetamido)-5-methylsulfonylture is stirred for 2 hours under ice-cooling, the mixture benzophenone is filtered, and the filtrate is concentrated in vacuo to 7 dryness. The oily residue is crystallized on treatment with 20 ml. of methanol to give 8.7 g of Z-trichloroacetamido--chlorobenzophenone'. m.p. 905 92.5C. Recrystallization from a mixture of ethanol and benzene gives colorless crystals, m.p. 93.0 940C. Step B To a solution of 5.7 g of 2-trichloroacetamido-5- chlorobenzophenone in 200 ml/of methanol is added 50 g of methanolic ammonia. and the mixture is left at room temperature. The solution is concentrated in vacuo to dryness. and the residue is washed with 30 ml. of ether, and water successively and dried to give 4-phenyl-6-chloro-2( 1 H)-quinazolinone, m.p. 300C.

To a suspension of 1.0 g of the compound in 30 ml. of ethanol is added 10 g of 10% aqueous sodium hydroxide. The mixture is dissolved by heating, and cooled to give the sodium salt as yellow needles,m.p. 300C.

EXAMPLE 2 Step A A solution of 1.8 g of trichloroacetyl chloride in 5 ml. of benzene is added dropwise to a mixture of 2.1 g of 2-amino-5-nitrobenzophenone, 40 ml. of benzene, 40 ml. of methylene chloride and 2 ml. of pyridine, and the mixture is stirred at room temperature for 1 hour. The reaction mixture is washed with water and dried over sodium sulfate, and the solvent is removed in vacuo. The residue is crystallized from 5 ml. of ethanol to give 2.5 g of 2-trich1oroacetamido-5-nitrobenzophenone. Recrystallization from a mixture of ethanol and chloroform gives prisms. m.p. 119C. Step B t To a solution of 2.3 g of 2-trichloroacetamido-5- nitrobenzophenone in 200 ml of tertiary-butyl alcohol is added 1.7 g of 10% methanolic ammonia, and the mixture is left at room temperature for 2 days. The solvent is removed under reduced pressure. and the residue is washed with 30 ml of methylene chloride. Thus 4-phenyl-6-nitro-2(1H)-quinazolinone is obtained as colorless crystals, m.p. 300C.

EXAMPLE 3' Step A To a mixture of 12.1 g of 2-amino-5-nitrobenzophenone, 120 ml of methylene chloride and 10 ml. of'pyridine is added dropwise 10.9 g of trichloroacetyl chloride at room temperature. After the mixture is stirred for 2 hrs., 50 m1. of water is added with stirring. The organic layer is separated, dried over sodium sulfate and evaporated under reduced pressure. The red oily residue is crystallized on treatment with ml. of ethanol under cooling to give 15.1 g of 2-trichloroacetamido-5- nitrobenzophenone, m.p. 116 117.5C. Recrystallization from a mixture of ethanol and chloroform gives lightbrown crystals, m.p. 1 180 119.0C. Step B A solution of 3.9 g of Z-trichloroacetamido-S- nitrobenzophenone in 100 ml. of tertiary-butyl alcohol is heated with 3.4 g of 10% ethanolic ammonia at about 120C. for 3 hours in a sealed tube. Then the mixture is concentrated in vacuo to dryness. The residue is washed with methylene chloride, and dried to give 4- phenyl-6-nitro-2( 1H)-quinazolinone.

EXAMPLE 4 Step A To a solution of 8.6 g of 2-methy1amino-5-chlorobenzophenone in ml. of ether is added dropwise 7.6 g of trichloroacetyl chloride at room temperature. The mixture is stirred under reflux for 4 hours. After cooling, the reaction mixture is washed with water. The ethereal layer is separated, dried over sodium sulfate and evaporated under reduced pressure. To the oily residue is added 30 ml. of ethanol and 10 ml. of petroleum ether. The precipitate is collected by filteration and dried to give 10.8 g of 2-(N-methyl-trichloroacetamido)-5-ch1orobenzophenone, m.p. 116 117C. Recrystallization from ethanol gives 10.3 g of colorless crystals, m.p. 1 17 118C. Step B 1 A solution of 2.0 g of Z-(N-methyl-trichloroacetamido)-5-chlorobenzophenone in 100 ml. of ethanol is-saturated with ammonia under cooling, and the mixture is left at room temperature. The mixture is concentrated in vacuo to dryness. The residue is washed with 20 ml. of ether, and dried to yield 1-methyl-4-phenyl-6-ch1oro-2( 1H )-quinazolinone, m.p. 220.5 221.0C.

Recrystallization from a mixture of chloroform and methanol gives slight yellow crystals, m.p. 221

EXAMPLE 5 Using the procedure described in Example 1, but replacing 2-amino-5-chlorobenzophenone employed in Step A by 2-amino-6-chlorobenzophenone, there is obtained 4-phenyl-5-chloro-2(1H)-quinazolinone, m.p. 284C. 1

EXAMPLE 6 Using the procedure described in'Example l, but replacing 2-amino-5-chlorobenzophenone employed in step A by 2-amino-5-methoxybenzophenone, there is obtained 4-phenyl-6-methoxy-2( 1 H )-quinazolinone, m.p. 287C.

EXAMPLE 7 EXAMPLE 8 Using the procedure similar to that described in Example 4, but replacing 2-methylamino-5-chlorobenzophenone employed Step A by 2-methylamino-3- chloro-S-methoxybenzophenone, there is obtained 1 methyl-4-(m-chlorophe nyl)-6-methoxy-2( 1H)- quinazolinone, m.p. 199 200C.

Similarly, using the procedure similar to that described in Example 4, but replacing Z-methylamino-S- chlorobenzophenone employed Step A by 2- ethylamino-2'-methyl-5-chlorobenzophenone, there is obtained 1-ethyl-4-(o-tolyl)-6-chloro-2(1l-l)-quinazolinone, m.p. 174 175C.

Similarly the following compounds are obtained. 1- methyl-4-phenyl-6-methoxy-2( 1H )-quinazolinone, m.p. 167 168C, 1-benZyL4-phenyl-6-chloro-2(1H)- quinazolinone, m.p. 183 184C, 1-methyl-4-phenyl- EXAMPLE 9 Using the procedure similar to that described in Example 4, but replacing 2methylamino5-chlorobenzophenone by 2-isopropylamino-5-chlorobenzophenone, there is obtained l-isopropyl-4-phenyl o chloro- 2( l H)-quinazolinone.

Example 10 Step A A solution of 4.0 g of trichloroacetylchloride in 10 ml. of isopropylether is added dropwise to a solution of 4.9 g of 2-allylamino-5chlorobenzophenone in 50 ml. of isopropylether at room temperature. The mixture is stirred under reflux for 4 hours. After cooling, the reaction mixture is washed with water. The ethereal layer is separated, dried over sodium sulfate and evaporated under reduced pressure. The yellow residue is crystallized from 80 ml. of methanol. Thus 3.5 g of Z-(N-allyltrichloroacetamido)-5-chlorobenzophenone is obtained as slight yellow crystals, mp. 131 .5 132.5C. Step B To a solution of 2.1 g of 2-(N-allyltrichloroacetamido)-5-chlorobenzophenone in a mixture of 20 ml. of chloroform and 50 ml. of ethanol is added 5.2 g of 5% ethanolic ammonia, and the mixture is left at room temperature for 4 days. The solvent is removed under reduced pressure. The residue is washed with 20 ml. of ether and dried to give 0.71 g of l-allyl-4-phenyl- 6-chloro-2( l H)-quinazolinone, m.p. 185.0 186.0C.

EXAMPLE 1 1 Step A To a mixture of' 5.0 g of 2-ethoxyethylamino-5- chloro-Zfluorobenzophenone, 40 ml. of methylene chloride and 3 ml. of pyridine is added dropwise a solution of 7.2 g of trichloroacetylchloride in 10 ml. of methylenechloride at room temperature. The mixture is stirred under reflux for 6 hours. After cooling, the reaction mixture is washed with water. The organic layer is separated, dried over sodium sulfate and concentrated in vacuo. The residual oil is chromatographed on a column of silica gel eluting with benzene to give 3.2 g of 2(N-ethoxyethyl trichloro acetamido)-5-chloro-2'- fluorobenzophenone as yellow oil. Step B To a solution of 2.4 g of Z-(N-ethoxyethyl-trichloroacetamido)-5-chloro-2-fluorobenzophenone in ml. of ethanol is added ml. of ethanol saturated with ammonia. The mixture is left at room temperature for 17 hours and the solution is concentrated in vacuo. The oily residue is crystallized on treatment with 10 ml. of isopropylether to give lethoxyethyl-4-(o-fluorophenyl)-6-chloro-2(lH)-quinazolinone, m.p. l47.0 148.0C.

Recrystallization from ethanol gives colorless needles, m.p. 151.0 152.0C.

Similarly, using the procedure described in Example 1 1, but replacing 2ethoxyethylamino-5-chloro-2'- fluorobenzophenone by Z-(B-diethylaminoethyl- )amino-S-chloro-2-fluorobenzophenone, there is obtained 1-(/3-diethyaminoethyl)-4-(o-fluorophenyl)-6- chloro-2( lH)-quinazolinone hydrochloride, which is 10 recrystallized from ethanol to give colorless crystals, mp. 223 224C. 1 1

What is claimed is:

1. A process for producing a quinazoline of the fori mula wherein R is hydrogen. C alkyl. C -C alkenyl, benzyl, (C alkoxy) C alkyl or di(C alkyl) amino (C alkyl); R R and R are each selected from the group consisting of hydrogen, halogen, C alkyl, C m alkoxy, nitro, C,- alkylthio, C alkylsulfonyl and a trifluoromethyl group, which comprises contacting with ammonia a trihaloacetamidobenzophenone of the wherein each of X X and X 3 is independently a halogen atom; and R. R R and R are as defined above. 2. A process according to claim 1 wherein R is benzyl.

3. A process for preparing a quinazoline of the formula R R1 IlI N R2 V 2-amino-benzophenone of the formula wherein R, R R and R are as defined above. with 21 R1 R X1 trihaloacetic acid of the formula 1 ICOCX2 X3 5 Xe-CCOOII R2 \V wherein each ofX,, X and X is independently halogen 10 I or acid halide or anhydride thereof. and then contactwherein X1 X0, X? R, Rh and R3 are as d fi d ing with ammonia the resulting trihaloaceticacetamidoabove benzophenone of the formula 

1. A PROCESS FOR PRODUCING A QUINAZOLINE OF THE FORMULA
 2. A process according to claim 1 wherein R is benzyl.
 3. A process for preparing a quinazoline of the formula 